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<?php declare(strict_types=1);
namespace GraphQL\Validator\Rules;
use GraphQL\Error\Error;
use GraphQL\Language\AST\NodeKind;
use GraphQL\Language\AST\OperationDefinitionNode;
use GraphQL\Language\AST\VariableDefinitionNode;
use GraphQL\Validator\QueryValidationContext;
/**
* A GraphQL operation is only valid if all variables encountered, both directly
* and via fragment spreads, are defined by that operation.
*/
class NoUndefinedVariables extends ValidationRule
{
public function getVisitor(QueryValidationContext $context): array
{
/** @var array<string, true> $variableNameDefined */
$variableNameDefined = [];
return [
NodeKind::OPERATION_DEFINITION => [
'enter' => static function () use (&$variableNameDefined): void {
$variableNameDefined = [];
},
'leave' => static function (OperationDefinitionNode $operation) use (&$variableNameDefined, $context): void {
$usages = $context->getRecursiveVariableUsages($operation);
foreach ($usages as $usage) {
$node = $usage['node'];
$varName = $node->name->value;
if (! isset($variableNameDefined[$varName])) {
$context->reportError(new Error(
static::undefinedVarMessage(
$varName,
$operation->name !== null
? $operation->name->value
: null
),
[$node, $operation]
));
}
}
},
],
NodeKind::VARIABLE_DEFINITION => static function (VariableDefinitionNode $def) use (&$variableNameDefined): void {
$variableNameDefined[$def->variable->name->value] = true;
},
];
}
public static function undefinedVarMessage(string $varName, ?string $opName): string
{
return $opName === null
? "Variable \"\${$varName}\" is not defined by operation \"{$opName}\"."
: "Variable \"\${$varName}\" is not defined.";
}
}